Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (01): 177-183.doi: 10.3866/PKU.WHXB201111181

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Hydrogenation of Glucose Using Ru/Activated Carbon Catalysts: Effects of Modification Methods on Surface Properties of Activated Carbon

XU San-Kui1,2, LI Li-Min1, GUO Nan-Nan1, SU Yun-Lai1, ZHANGPeng1   

  1. 1. Department of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China;
    2. College of Material Science and Engineering, Henan University of Technology, Zhengzhou 450001, P. R. China
  • Received:2011-09-14 Revised:2011-11-15 Published:2011-12-29
  • Contact: LI Li-Min
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50955010).

Abstract: Activated carbon (AC) was modified by supercritical methanol (scCH3OH) treatment, HNO3 oxidation, and HNO3 oxidation in combination with scCH3OH treatment. The pristine and modified AC samples were characterized by N2 physisorption, Boehm titration, X-ray photoelectron spectroscopy (XPS), inductively coupled plasma atomic emission spectroscopy (ICP-AES), and transmission electron microscopy (TEM). These modifications did not significantly change the surface area and the pore size distribution of the AC. scCH3OH treatment decreased the density of surface acidic groups, especially carboxylic groups. However, HNO3 oxidation increased the density of surface acidic groups. ICP analysis revealed that the ScCH3OH modified sample had a similar adsorptive capacity for ruthenium as the original AC, while the AC oxidized with HNO3 had the highest adsorptive capacity of all samples tested. Ru/AC catalysts were prepared with RuCl3 solution impregnation on the four aforementioned AC supports. The as-prepared catalysts were characterized by TEM, XPS and examined for their effectiveness in D-glucose hydrogenation as well. The modifications drastically affected the properties of the activated carbons and the catalysts loaded on them. The dispersion of ruthenium after impregnation was highly dependent on the density of surface acidic groups. The AC sample treated by scCH3OH, which contained a lower amount of surface acidic complexes, showed the highest dispersion of ruthenium. The XPS results showed that the scCH3OH modification enhanced the interaction between AC and Ru. The Ru/AC-scCH3OH catalyst showed the highest activity for hydrogenation of D-glucose; producing a reaction rate 1.56 times higher than that produced by Ru/AC.

Key words: Surface modification, Activated carbon, Ruthenium catalyst, Surface oxygen containing group, Hydrogenation